[patch #7562] [PATCH] AX_C_CHECK_FLAG: Do not use AC_PROG_SED

[Maarten Bosmans]

Follow-up Comment #2, patch #7562 (project autoconf-archive):

There are more macros like this: cxx cpp cxxcpp and ld variant. Those should
be changed also.

But more importantly, it is not necessary to use sed at all. You can use
m4_bpatsubst, or better yet AS_TR_SH, or better yet AS_VAR_PUSHDEF. Those
seems to be available at least prior to 2.51.

Please have a look at the mails I sent to the list (june 20)
http://lists.gnu.org/archive/html/autoconf-archive-maintainers/2011-06/index.html
to propose a solution for all these macros (and several other, very similar
ones)

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